The physician writes the order for the TPN prescription. Often a form is used.
The pharmacist mixes the TPN solution using aseptic technique. Prescriptions are compounded by mixing the solutions at a 1:1 dextrose-to-amino acid ratio and placing in 1-L bags. Alternatively, lipids can be mixed with the dextrose/amino acid solution, referred to as the 3-in-1 total nutrient admixture (TNA).
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